S9 Autoset using 12v power

[dshel17]

It's summer and I am trying to figure out how to use my S9 Autoset from 12v since I will be outdoors quite a bit. I have a few questions maybe a few of you know the answers to. I see they finally have a dc converter cable available for the S9 and they specify approximately 6A power consumption using the cpap with humidifier. Does anyone know the power consumption without the humidifier? Resmed has a "travel" document that gives specs for use with an inverter and different configurations but they dont have specs updated for use with a converter and a S9. In the interest of saving battery power do people use their machines without the humidifier for those occasional day or two away from ac power? The last question I have is I see there is a 30W ac adapter for use without the humidifier. Comparing the 90W vs the 30W AC adapter, Does the 30W use less power than the 90W when they are both running just the cpap w/o humidifier or do they use the same since they are both powering the identical load and the only difference is the 90W is capapble of greater power output if needed? sorry for such a long post with multiple questions!! I have benefited greatly and learned a ton from the members of this group!!

[Guest]

The S9 30W power supply is unable to power the H5i. It's for the S9 only.

[archangle]

Comparing the 90W vs the 30W AC adapter, Does the 30W use less power than the 90W when they are both running just the cpap.

The only way to tell would be to measure it. It could go either way. It's even possible the 90W adapter is designed to be more efficient and draws less current than the 30W adapter at the same load. I doubt you'll find specifications for either adapter that actually show you typical usage under a typical load, only maximum allowable loads.

[GumbyCT]

It's summer and I am trying to figure out how to use my S9 Autoset from 12v since I will be outdoors quite a bit. I have a few questions maybe a few of you know the answers to. I see they finally have a dc converter cable available for the S9 and they specify approximately 6A power consumption using the cpap with humidifier. Does anyone know the power consumption without the humidifier? Resmed has a "travel" document that gives specs for use with an inverter and different configurations but they dont have specs updated for use with a converter and a S9. In the interest of saving battery power do people use their machines without the humidifier for those occasional day or two away from ac power? The last question I have is I see there is a 30W ac adapter for use without the humidifier. Comparing the 90W vs the 30W AC adapter, Does the 30W use less power than the 90W when they are both running just the cpap w/o humidifier or do they use the same since they are both powering the identical load and the only difference is the 90W is capapble of greater power output if needed? sorry for such a long post with multiple questions!! I have benefited greatly and learned a ton from the members of this group!!

I am surprised that none of the Resmed experts have replied. I am doubly surprised that no one has told you that Resmeds run on 24VDC and that DC converter just converts the 12 to 24V. So if you are technically handy you might figure out another way.

[billbolton]

Comparing the 90W vs the 30W AC adapter, Does the 30W use less power than the 90W when they are both running just the cpap w/o humidifier or do they use the same since they are both powering the identical load and the only difference is the 90W is capapble of greater power output if needed?

Basically the operational power drain will be the same for both adapters.

However, you need to keep in mind that the 90W adapter will have a higher in-rush current when first starting up, which may matter if you are running it off a low capacity inverter.

that DC converter just converts the 12 to 24V

The Resmed DC adapters do more than just convert DC voltage, as has been covered here previously on a number of occasions.

Cheers,

Bill

[GumbyCT]

that DC converter just converts the 12 to 24V

The Resmed DC adapters do more than just convert DC voltage, as has been covered here previously on a number of occasions.

Cheers,

Bill

You are so clear in your info. And what else could possibly be needed?

Do you get a kiss? Is that covered previously elsewhere too?

[louspeachy]

that DC converter just converts the 12 to 24V

The Resmed DC adapters do more than just convert DC voltage, as has been covered here previously on a number of occasions.

Cheers,

Bill

You are so clear in your info. And what else could possibly be needed?

Do you get a kiss? Is that covered previously elsewhere too?

Somebody got out of the wrong side of the bed this morning? Unhappy miserable people want everyone else to feel the same. Sad.....

Louise

[Guest]

The S9 power input has THREE wires. It needs that third wire to work. Just inputting 24V isn't enough.

[GumbyCT]

The S9 power input has THREE wires. It needs that third wire to work. Just inputting 24V isn't enough.

Who knows what the 3rd wire is for?

[GumbyCT]

My guess is the 3rd wire is a sense input which goes either the positive or negative lead of the battery and can be jumpered right at the connector. Since the center pin of Resmed is negative (iirc) I would start there first (50/50). This is not Voodoo folks.

IF someone already has one of the "Magic Boxes" they can easily ohm it out.

[Guest]

I can tell you it's not that simple...

[Slartybartfast]

It's at times like this that I recall that my dear old grandmother used to say, "If you can't say anything nice, keep your mouth shut, or I'll slap you!"

[GumbyCT]

It's at times like this that I recall that my dear old grandmother used to say, "If you can't say anything nice, keep your mouth shut, or I'll slap you!"

You treat people who are only trying to help like that and then you expect others to go to any trouble to help you? You expect too much of human nature.

You obviously misunderstood something. This DC cable not for me, mine works fine. I was (only) trying to help those who are trying to use Resmed on DC. It was not me with the quick one-liners, my friend.

[kempo]

Here ya go: http://cgi.ebay.com/ResMed-S9-series-DC ... 2a11ba7417

[archangle]

My guess is the 3rd wire is a sense input which goes either the positive or negative lead of the battery and can be jumpered right at the connector. Since the center pin of Resmed is negative (iirc) I would start there first (50/50). This is not Voodoo folks.

IF someone already has one of the "Magic Boxes" they can easily ohm it out.

I have no info on what's in the ResMed connector, but don't be too sure you can figure it out. Some of the scumbag computer manufacturers have started putting circuitry in their laptops that looks for a digital signal on the external power supply cable such that you can only use the manufacturers overpriced power supply.

They would of course claim it's to protect the laptop from damage from a substandard power supply.